Log entry time 14:22:02 on February26,2010

Entry number 310064

The CompSimple DAQ tests for Compton have been finished.
We used pulsers to simulate coincidences and a high-rate random
pulse from a PMT to mix in randoms (see fig 1).  The timestamp
data mostly makes sense, except there are some spurious zeros
in the ETROC and there are some "large times" not shown in the
figure 2 (what's there are the "normal times").  This is not 
completely understood yet.  Nevertheless, plotting the time
difference we see coincidences (bottom right plot of fig 2).
Note: The reason for the spikes is clearly understood -- there
are about 10 coinc. events per helicity period, and they are not
randomly distributed in time.  This causes the spikes away
from zero.  

Tomorrow (Sat) afternoon we will dismantle this setup and restore
the "std" DAQ setup.  Mindy wants to take a few more long runs and
then we are done.